Drill bit for a down-the-hole drill hammer having spirally arranged cutting inserts
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United States of America Patent
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Nov 21, 2017
Grant Date -
Dec 3, 2015
app pub date -
May 21, 2015
filing date -
May 29, 2014
priority date (Note) -
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Abstract
A drill bit for a down-the-hole drill hammer is provided that includes a head and a shank extending from the head. The head includes a plurality of non-concentrically or spirally arranged cutting members about its working face. The non-concentric or spiral arrangement of the cutting members in the drill bit and their overlapping cutting paths during rotation of the drill bit reduces the presence of concentric grooves or valleys being cut into the earthen terrain impacted by the bit thereby resulting in more complete cutting coverage.
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